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Last modified
1/25/2010 7:08:31 PM
Creation date
10/5/2006 2:09:34 AM
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Floodplain Documents
County
Statewide
Basin
Statewide
Title
Floodplain Management in the United States An Assessment Report Volume 1
Date
1/1/1992
Prepared For
The Federal Interagency Floodplain Management Task Force
Prepared By
The Natural Hazards Research and Applications Information Center, CU Boulder
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />FLOODPLAIN MANAGEMENT <br /> <br />Fluoriplain ,Hana.f!,emmt i.1 a dcC/sionmaking <br />,bnhfll fht goal I~l whidl i.l" to (ultial' illl.I"/' USf' <br />I~f Ihr lIal/ur! 's poodp/ains. ., IVlst us/'" is 1m)" <br />artii'l{j' 0'- )1'1 I~f (/(/Il,illl'.\- :hal II (Olr!/!ati/;/t 1flith <br />,'hI' fnk /0 natural rt")"0111(1'5 (I,alural and bnl(li'- <br />..ia! funaions ~/..t7oodpiams) and human <br />m-OUTrr.'I (iik and jJroj1irlJ). C(;mj)afi/;iti~); t\ <br />(]rhrii'f'{J through 1111' \!rtllrgi('J {lWI/0/i/J (!{ In/' <br />(':rI!~/icd J.\'alwnal Pmgmm for Flo~,a/)lair: <br />JlallrIgnT/enl <br /> <br />Pm'ious page: The Yellowswru: River and Ha}'den Vailey <br />in Yellou.;sto7U' iValianal Park are a river and jloodphin <br />lelati~e?y undisturbed b)' humllrl. intruswn. <br /> <br />- <br />8 <br /> <br />Floodplains <br /> <br />Floodplains are the lowlands adjoining the channels of rivers, streams or <br />other watercourses, or the shorelines of oceans, lakes, or other bodies of stand- <br />ing water. They are lands that have been or may be inundated by flood water. <br />Floodplains are shaped by dynamic physical and biological processes: climate, <br />the hydrologic cycle, erosion and deposition, extreme natural events, and <br />other forces. The products of the complex interrelationships of these processes <br />are many of the nation's most beautiful landscapes, most productive wetlands, <br />and most fertile soils, along with rare and endangered plants and animals, and <br />sites of archaeologic and historic significance. Throughout our history, rivers <br />and other bodies of water have been highways for exploration, migration, and <br />commerce and have been used as disposal systems for the byproducts of indus- <br />trial society. Almost all major cities are located on a river or at the mouth of <br />a river. Most smaller communities have at least one stream that helps define <br />local character and is an important source of community identity. <br /> <br />The Floodplain with Floodway <br /> <br /> <br /> <br />I Floodway : <br />Flood Fringe Flood Fringe <br />I' I' <br />I I I' <br />:: ;: <br />I I I I <br />ri "100-Year"Floodplain i---l <br /> <br />Flood Fringe Flood Fringe <br />Floodway <br /> <br /> <br /> <br />Channel <br /> <br />The U.S. \Vater Resources Council estimated in 1977 that about 7%, or <br />178.8 million acres, of the total area of the United States, including Alaska and <br />Hawaii, Puerto Rico, and the Virgin Islands, was \....ithin the lOO-year flood- <br />plain. The Federal Emergency tvlanagement Agency, in a 1991 study that <br />examined nearly 17,500 mapped flood prone communities in the 50 states and <br />the District of Columbia, estimated that there are about 94 million acres. The <br />largest areas of floodplain are in the southern pan of the country, but the <br />most populous are along the north Atlantic coast, in the Great Lakes region, <br />and in California. <br /> <br />The Value of Floodplains <br /> <br />In their natural state, floodplains have enormous but often unrecognized <br />value. These complex dynamic systems contribute to the physical and bio- <br />logical support of water resources, living resources, and cultural resources. <br />Floodplains are important to the nation's water resources because they pro- <br />vide natural flood and erosion control, help maintain high water quality, and <br />contribute to sustaining groundwater supplies. Floodplains have living, or bio- <br />logic, resource value, because they support a wide variety of flora and provide <br />
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